Is Seaside ready for production?

Show me applications built with Seaside?

Where can I find Seaside tutorials?

Is Seaside free? What license does Seaside use?

As of the Seaside 2.5 (8 January 2004), Seaside has been under the MIT license. This means that you can use it to build commercial apps, royalty free, with no restrictions. Note that, besides Squeak, this also applies to commercial Smalltalks such as Cincom Smalltalk and Dolphin Smalltalk.